caa a22 4500 445891386 CHVBK 20180317145617.0 cr unu---uuuuu 170323e20110101xx s 000 0 eng 10.1007/s10750-010-0477-3 doi (NATIONALLICENCE)springer-10.1007/s10750-010-0477-3 Sustainability assessment and comparison of efficacy of four P-inactivation agents for managing internal phosphorus loads in lakes: sediment incubations [Elektronische Daten] [Max Gibbs, Christopher Hickey, Deniz Özkundakci] A novel application of a continuous flow incubation system (CFIS) was used to assess four phosphorus (P) inactivation agents—alum, Phoslock™, a new modified zeolite (Z2G1 or Aqual-P™), and allophone—when used as sediment capping agents to manage internal P loads in lakes. The CFIS technique allowed combined efficacy and sustainability assessment, including: (1) flux measurements during simulation of stratified (anoxic) and mixed (aerobic) conditions on the same sediment through multiple cycles to assess the longevity of a range of product doses; (2) simulation of a summer algal bloom collapse and subsequent burial of the products; and (3) investigation of non-target effects on nitrification and denitrification processes at the sediment-water interface. Minimum P-removal dose rates were found to differ substantially at 80gm−2 for alum, 190gm−2 for Z2G1, 220gm−2 for allophane and 280gm−2 for Phoslock™, for similar capping layer thickness of about 2mm, and would be effective for at least 4years. All products temporarily suppressed nitrification and denitrification under aerobic conditions, and it may be important to minimise product application to any permanently aerobic zones, such as the littoral areas of a lake. While the aluminium (Al)-based products did not enhance Al fluxes in the CFIS, lanthanum (La) was released at a near constant rate of around 2mg La m−2 day−1 from the Phoslock™ treatments over a period of at least 14days. Spatial variability of sediment P, bioturbation, and burial are factors that will affect up-scaling these results to a whole lake. Springer Science+Business Media B.V., 2010 Lake restoration nationallicence Internal P load nationallicence P-inactivation agents nationallicence Alum nationallicence Phoslock™ nationallicence Modified zeolite nationallicence Allophane nationallicence Sediment capping nationallicence Phosphorus nationallicence Nitrogen nationallicence Sustainability nationallicence Gibbs Max National Institute of Water and Atmospheric Research Ltd., PO Box 11-115, Hamilton, New Zealand aut Hickey Christopher National Institute of Water and Atmospheric Research Ltd., PO Box 11-115, Hamilton, New Zealand aut Özkundakci Deniz Centre for Ecology and Biodiversity Research, University of Waikato, Private Bag 3105, Hamilton, New Zealand aut Hydrobiologia Springer Netherlands 658/1(2011-01-01), 253-275 0018-8158 658:1<253 2011 658 10750 https://doi.org/10.1007/s10750-010-0477-3 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10750-010-0477-3 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Gibbs Max National Institute of Water and Atmospheric Research Ltd., PO Box 11-115, Hamilton, New Zealand aut NATIONALLICENCE 700 1- Hickey Christopher National Institute of Water and Atmospheric Research Ltd., PO Box 11-115, Hamilton, New Zealand aut NATIONALLICENCE 700 1- Özkundakci Deniz Centre for Ecology and Biodiversity Research, University of Waikato, Private Bag 3105, Hamilton, New Zealand aut NATIONALLICENCE 773 0- Hydrobiologia Springer Netherlands 658/1(2011-01-01), 253-275 0018-8158 658:1<253 2011 658 10750 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer